Ethernet boot loader and UARTprintf

Alex Farber38

I have boot_serial code sample customized to work as Ethernet boot loader. Customization is done by changing some constants in bl_config.h file. This file is attached to the post. It works with enet_lwip code sample.

When the board starts, boot loader successfully loads enet_lwip program from address 0x4000. I can make Ethernet update using eflash program.

Now I want to learn better, how boot loader works, when the board is powered up. I am trying to do this using UARTprintf. So, I added uartstdio.h and uartstdio.c files to boot_serial project, and made the following change in CheckForceUpdate function:

uint32_t
CheckForceUpdate(void)
{

#ifdef CHECK_CRC
    uint32_t ui32Retcode;
#endif

#ifdef BL_CHECK_UPDATE_FN_HOOK
    //
    // If the update check function is hooked, call the application to determine
    // how to proceed.
    //
    return(BL_CHECK_UPDATE_FN_HOOK());
#else
    uint32_t *pui32App;

#ifdef ENABLE_UPDATE_CHECK
    g_ui32Forced = 0;
#endif

    // new lines:
    UARTStdioConfig(0, 115200, 120000000);		// 120000000 like in EnetReconfig(120000000)  call
    UARTprintf("CheckForceUpdate\n");

This function is called when board is powered up or reset. However, COM port monitor on the PC doesn't print "CheckForceUpdate" line. Probably, some other initialization is missing. How can I fix this and get UARTprintf tracing in the bootloader?

over 9 years ago

0 Alex Farber38 over 9 years ago

Intellectual 360 points

Customized bl_config.h file is attached. Ways to reproduce the problem:

1. Replace bl_config.h in boot_serial with attached file. Add the path "C:\ti\TivaWare_C_Series-2.1.3.156\driverlib\ccs\Debug\driverlib.lib" under ARM Linker-> File Search Path -> Include library file.

2. Add uartstdio.c and uartstdio.h files to boot_serial.

3. Modify CheckForceUpdate function as written in my original post.

4. Run COM port monitor on PC.

5. Burn boot_serial using JTAG. Press Reset button on the board.

6. CheckForceUpdate line is not printed, as I expect.

7167.bl_config.h

0 Amit Ashara over 9 years ago

TI__Guru**** 244400 points

Hello Alex

I am not sure what you are getting at, but first check if the system clock is indeed 120MHz. Or better still change the UART clock to PIOSC so that the UART clock is alway ~16MHz for a baud rate out.

0 Alex Farber38 over 9 years ago in reply to Amit Ashara

Intellectual 360 points

Hello Amit,

I found that boot loader is perfectly working both when it is activated by application, and on power up. So, this question is not actual anymore.

Thank you.

0 Amit Ashara over 9 years ago in reply to Alex Farber38

TI__Guru**** 244400 points

Hello Alex

If the boot loader is working fine, then why do you wish to add more code to it which has no real value in terms of final product?

0 Alex Farber38 over 9 years ago in reply to Amit Ashara

Intellectual 360 points

Hello Amit,

I mean: since boot loader is working fine, I don't need to make any changes to it, this question is not actual and can be deleted or closed.

Thank you.

0 Amit Ashara over 9 years ago in reply to Alex Farber38

TI__Guru**** 244400 points

Hello Alex

OK. Thanks for confirming

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Ethernet boot loader and UARTprintf